Polyols in a sentence

Polyols Polyols can be polyether polyols, which are made by the reaction of epoxides with an active hydrogen containing compounds Polyester polyols are made by the polycondensation of multifunctional carboxylic acids and polyhydroxyl compounds.

Polyester polyols are usually more expensive and more viscous than polyether polyols, but they make polyurethanes with better solvent, abrasion, and cut resistance.

Polyether polyols are mostly made by co-polymerizing ethylene oxide and propylene oxide with a suitable polyol precursor. citation Polyester polyols are made similarly to polyester polymers.

Polyether polyols were cheaper, easier to handle and more water-resistant than polyester polyols, and became more popular.

Polyols made with only propylene oxide are terminated with secondary hydroxyl groups and are less reactive than polyols capped with ethylene oxide, which contain primary hydroxyl groups.

The graphic shows how the new combination of acidolysis and hydrolysis can recover up to 82 weight percent of the original material from flexible PUR foam—used in mattresses—as two separate fractions of diamines and polyols.

We also make intermediates, such as mono ethylene glycol (MEG), polyols and alpha olefins, and certain performance products, such as polyethylene.

Both the isocyanates and polyols used to make polyurethanes contain, on average, two or more functional groups per molecule.

Conventional polyester polyols are based on virgin raw materials and are manufactured by the direct polyesterification of high-purity diacids and glycols, such as adipic acid and 1,4-butanediol.

Despite them being complex mixtures, industrial grade polyols have their composition sufficiently well controlled to produce polyurethanes having consistent properties.

Initiators such as ethylenediamine and triethanolamine are used to make low molecular weight rigid foam polyols that have built-in catalytic activity due to the presence of nitrogen atoms in the backbone.

Natural oil polyols derived from castor oil and other vegetable oils are used to make elastomers, flexible bunstock, and flexible molded foam.

Other polyester polyols are based on reclaimed raw materials.

Polyisocyanates became commercially available in 1952, and production of flexible polyurethane foam began in 1954 using toluene diisocyanate (TDI) and polyester polyols.

Polyols are polymers in their own right and have on average two or more hydroxyl groups per molecule.

Polyols used to make rigid polyurethanes have molecular weights in the hundreds, while those used to make flexible polyurethanes have molecular weights up to ten thousand or more.

Renewable source used to prepare polyols may be dimer fatty acid citation or fatty acid.

Sorbitol and xylitol are examples of sugar alcohols (also known as polyols).

The choices available for the isocyanates and polyols, in addition to other additives and processing conditions allow polyurethanes to have the very wide range of properties that make them such widely used polymers.

These low molecular weight, aromatic polyester polyols are used in rigid foam, and bring low cost and excellent flammability characteristics to polyisocyanurate (PIR) boardstock and polyurethane spray foam insulation.